A tweak has been developed that re-enables the old sand generators. I've installed it and it works; my sand generator is once again online. If you need sandstone, I recommend that you make use of it because I plan on removing the fix and replacing it with the (slower and more balanced) plugin whenever that plugin becomes available.
[edit] I've also found a program that makes it easy to make London Tube-style rail maps. I've updated the rail map in the OP with a new version in this style. If I've missed any stations or lines, please let me know.
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